ISO INTERNATIONAL 24578 STANDARD First edition 2021-03 Hydrometry Acoustic Doppler profiler Method and application for measurement of flow in open channels from a moving boat Hydrometrie - Profileurs acoustiques d effet Doppler- Methode et applicationpourlemesuragedeI'ecoulementa surfacelibre surun bateaumobile Reference number IS0 24578:2021(E) ISO @ IS0 2021 IS0 24578:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either Iso at the address below or ISo's member body in the country of the requester. ISO copyright office CP 401 · Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone: +41 22 749 0111 Email:[email protected] Website: www.iso.org Published in Switzerland ii IS02021-Allrightsreserved IS024578:2021(E) Contents Page Foreword Introduction. ..vi 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions. .1 4 Principles oftheboatmountedADCPmethod .3 4.1 General. 3 4.2 Doppler principle applied to moving objects 4 4.3 Acoustic Doppler current profiler techniques 5 4.3.1 General. 5 4.3.2 Pulseincoherent 5 4.3.3 Pulse-to-pulse coherent. 6 4.3.4 Broadband (Spread spectrum) 6 4.4 Measurement of velocity profile 6 4.4.1 General 6 4.4.2 Measurementofrelativevelocity 6 4.4.3 Measurement of boat velocity 6 4.4.4 Near boundary data collection 8 4.5 Speed of sound in water. 10 5 Flow determination. .11 5.1 Generalmethod 11 5.2 Measurement procedure 13 5.3 Method dealing with moving-bed condition without GNSS system 15 5.3.1 General. 15 5.3.2 Stationary moving-bed method 15 5.3.3 Azimuthmethod. 16 5.3.4 Subsection correctionmethod 16 5.3.5 Loopmethod 17 5.3.6 Mid-section method 19 Site selection 6 .19 6.1 General 19 6.2 Site-selection criteria 20 7 ADCP Deployment procedure .21 7.1 Deployment techniques. 21 7.1.1 General. 21 7.1.2 Manned boat mounted 21 7.1.3 Tethered boat. 21 7.1.4 Deployment on a remote-control craft 22 7.1.5 Data retrieval modes 22 7.2 Operation of boat. 22 7.2.1 Boat path. 22 7.2.2 23 Boat speed 7.3 Field procedures. 23 7.3.1 Pre-field procedures 23 7.3.2 Field setup 23 7.3.3 ReviewingADCPdataduring measurement 26 7.3.4 Postmeasurementrequirements 26 7.4 Ancillaryequipment. 27 7.5 Other consideration 27 7.5.1 Edge distances 27 7.5.2 Depth measurements at sites with high sediment concentrations. .27 7.5.3 GNSS compass. 28 @ IS0 2021 - All rights reserved ii